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This is hilarious, of course. But there are cases very similar to the one you mention where seemingly tautologous lines are not a real tautology. For instance, the following script will not work without the lines in red:

/* Emits a 7-Hz tone for 10 seconds.
True story: 7 Hz is the resonant frequency of a
chicken's skull cavity. This was determined
empirically in Australia, where a new factory
generating 7-Hz tones was located too close to a
chicken ranch: When the factory started up, all the
chickens died.
Your PC may not be able to emit a 7-Hz tone. */
main()
{
sound(7);
delay(10000);
nosound();
}

Not from the link provided, but still funny

Code:

motor[Wheel_Left] = 50;
motor[Wheel_Right] = 45; // to make it go in a straight line